A New Brominated Diphenyl Ether from the Marine Sponge Dysidea herbacea.

2000 ◽  
Vol 53 (4) ◽  
pp. 299 ◽  
Author(s):  
Bruce F. Bowden ◽  
Leanne Towerzey ◽  
Peter C. Junk
Keyword(s):  
Great Barrier Reef ◽  
Marine Sponge ◽  
Polybrominated Diphenyl Ethers ◽  
Diphenyl Ether ◽  
Two Dimensional ◽  
Barrier Reef ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diphenyl Ethers ◽  
Dysidea Herbacea

Samples of Dysidea herbacea collected at Pelorus Island, Great Barrier Reef, Australia, afforded a new polybrominated diphenyl ether (1). The structure was determined by n.m.r. two-dimensional methods and by an X-ray diffraction study. N.m.r. spectral assignments for (1) and some previously reported isomeric polybrominated diphenyl ethers are discussed.

New Chlorinated Metabolites from the Tropical Marine Sponge Dysidea herbacea

1997 ◽  
Vol 50 (2) ◽  
pp. 139 ◽  
Author(s):  
Eric J. Dumdei ◽  
Jamie S. Simpson ◽  
Mary J. Garson ◽  
Karl A. Byriel ◽  
Colin H. L. Kennard
Keyword(s):  
Great Barrier Reef ◽  
Marine Sponge ◽  
Crystallographic Analysis ◽  
Southern Region ◽  
Barrier Reef ◽  
X Ray ◽  
Dysidea Herbacea ◽  
Absolute Stereochemistry

Three new chlorinated metabolites, namely 3-(3,3-dichloro-2-methylpropyl)-6-(3,3-dichloro-2-methyl-propylidene)-1,4-dimethylpiperazine-2,5-dione (3), 1-methyl-3-(3,3,3-trichloro-2-methylpropyl)-6-(3,3,3-richloro-2-methylpropylidene)piperazine-2,5-dione (4) and 5,5-dichloro-4-methyl-2-[methyl(4,4-dichloro-3-methyl-1-oxobutyl)amino]-N-(thiazol-2-ylmethyl)pentanamide (8), have been isolated from collections of Dysidea herbacea from the southern region of the Great Barrier Reef. The relative and absolute stereochemistry of (4) was determined by X-ray crystallographic analysis.

A new two-fold interpenetrating two-dimensional copper(II) coordination polymer constructed from 4,4′-bis(2-methylimidazol-1-yl)diphenyl ether

2020 ◽  
Vol 75 (4) ◽  
pp. 347-352
Author(s):  
Liang Liang ◽  
Chen-Dong Pan ◽  
Jun Wang
Keyword(s):  
Diphenyl Ether ◽  
Metal Organic Framework ◽  
Oxidative Degradation ◽  
Photocatalytic Property ◽  
Isophthalic Acid ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
Degradation Of Methyl Orange

AbstractA new Cu(II) metal-organic framework, [Cu(BMIOPE)(Br-BDC)]n (1) [Br-H2BDC = 5-bromo-isophthalic acid, BMIOPE = 4,4′-bis(2-methylimidazol-1-yl)diphenyl ether], has been hydrothermally synthesized and characterized through IR spectroscopy, elemental and thermal analysis, and single-crystal X-ray diffraction. Complex 1 possesses a unique two-fold interpenetrating two-dimensional framework with sql topology. The photocatalytic property of complex 1 for oxidative degradation of methyl orange and methylene blue with hydrogen peroxide was examined under UV irradiation.

The Great Barrier Reef Expedition 1928–29: The crystal structure and occurrence of weddellite, ideally CaC2O4·2.5H2O, from the Low Isles, Queensland

2016 ◽  
Vol 80 (2) ◽  
pp. 399-406 ◽  
Author(s):  
Stuart J. Mills ◽  
Andrew G. Christy
Keyword(s):  
Crystal Structure ◽  
Coral Reef ◽  
Low Temperature ◽  
Great Barrier Reef ◽  
Single Crystal ◽  
Structure Study ◽  
Barrier Reef ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Report

Abstract“Envelope crystals” collected during The Great Barrier Reef Expedition in May 1929 have been studied using low-temperature synchrotron single-crystal X-ray diffraction. The crystals are shown to be weddellite, with the largest content of zeolitic water reported to date. A new H2O site has been located within the crystal structure. Study of the crystals show that the end-member formula for weddellite should be reported as CaC2O4·(2.5 – x)H2O, where 0≤x≤ 0.25, instead of CaC2O4·(2H2O or CaC2O4·(2 + x )H2O. This is also the first report of weddellite occurring in a coral reef.

A threefold interpenetrating two-dimensional zinc(II) coordination polymer: synthesis, crystal structure and selective luminescence sensing properties

2019 ◽  
Vol 75 (7) ◽  
pp. 979-984 ◽  
Author(s):  
Chen-Dong Pan ◽  
Jun Wang ◽  
Ju-Qin Xu ◽  
Kang-Feng Zhang ◽  
Xiao-Wan Wang
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Aqueous Solution ◽  
Coordination Polymer ◽  
Diphenyl Ether ◽  
Biological Processes ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coordination Framework

The Fe3+ ion is the most important element in environmental systems and plays a fundamental role in biological processes. Iron deficiency can result in diseases and highly selective and sensitive detection of trace Fe3+ has become a hot topic. A novel two-dimensional ZnII coordination framework, poly[[μ-4,4′-bis(2-methylimidazol-1-yl)diphenyl ether-κ2 N 3:N 3′](μ-4,4′-sulfonyldibenzoato-κ2 O:O′)zinc(II)], [Zn(C14H8O6S)(C20H18N4O)] n or [Zn(SDBA)(BMIOPE)] n , (I), where H2SDBA is 4,4′-sulfonyldibenzoic acid and BMIOPE is 4,4′-bis(2-methylimidazol-1-yl)diphenyl ether, has been prepared and characterized by IR, elemental analysis, thermal analysis and X-ray diffraction analysis, the latter showing that the coordination polymer exhibits a threefold interpenetrating two-dimensional 44-sql network. In addition, it displays a highly selective and sensitive sensing for Fe3+ ions in aqueous solution.

Coscinoquinol, a New Cytotoxic Sesterterpene From a Dictyoceratid Sponge, Coscinoderma sp.

1994 ◽  
Vol 47 (1) ◽  
pp. 191 ◽  
Author(s):  
GV Alea ◽  
AR Carroll ◽  
BF Bowden
Keyword(s):  
Great Barrier Reef ◽  
Marine Sponge ◽  
Biological Activities ◽  
Two Dimensional ◽  
Barrier Reef ◽  
One Dimensional

A marine sponge, Coscinoderma sp., from the Great Barrier Reef, Australia, contained a new sesterterpene hydroquinone, coscinoquinol (1). The structure was elucidated by one-dimensional and two-dimensional n.m.r. techniques. Cytotoxicity and other biological activities are reported for (1).

Tubulin structure at intermediate resolution

1995 ◽  
Vol 53 ◽  
pp. 852-853
Author(s):  
K. H. Downing ◽  
S. G. Wolf ◽  
E. Nogales
Keyword(s):  
High Resolution ◽  
Structural Data ◽  
Therapeutic Drug ◽  
Zinc Ions ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Negative Stain ◽  
Functional Mechanisms ◽  
Tubulin Structure

Microtubules are involved in a host of critical cell activities, many of which involve transport of organelles through the cell. Different sets of microtubules appear to form during the cell cycle for different functions. Knowledge of the structure of tubulin will be necessary in order to understand the various functional mechanisms of microtubule assemble, disassembly, and interaction with other molecules, but tubulin has so far resisted crystallization for x-ray diffraction studies. Fortuitously, in the presence of zinc ions, tubulin also forms two-dimensional, crystalline sheets that are ideally suited for study by electron microscopy. We have refined procedures for forming the sheets and preparing them for EM, and have been able to obtain high-resolution structural data that sheds light on the formation and stabilization of microtubules, and even the interaction with a therapeutic drug.Tubulin sheets had been extensively studied in negative stain, demonstrating that the same protofilament structure was formed in the sheets and microtubules. For high resolution studies, we have found that the sheets embedded in either glucose or tannin diffract to around 3 Å.

Synthesis and Structure of a Clathrated Two-Dimensional Metal-Organic Framework: [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2·H2O (L = Bis(1-pyrazinylethylidene)hydrazine)

2008 ◽  
Vol 73 (1) ◽  
pp. 24-31
Author(s):  
Dayu Wu ◽  
Genhua Wu ◽  
Wei Huang ◽  
Zhuqing Wang
Keyword(s):  
Metal Organic Framework ◽  
Channel Structure ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
X Ray ◽  
Square Planar ◽  
Metal Organic ◽  
Aqueous Meoh ◽  
Organic Framework

The compound [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2 was obtained by the reaction of Cd(ClO4)2, bis(1-pyrazinylethylidene)hydrazine (L) and 4,4'-bipyridine in aqueous MeOH. Single-crystal X-ray diffraction has revealed its two-dimensional metal-organic framework. The 2-D layers superpose on each other, giving a channel structure. The square planar grids consist of two pairs of shared edges with Cd(II) ion and a 4,4'-bipyridine molecule each vertex and side, respectively. The square cavity has a dimension of 11.817 × 11.781 Å. Two guest molecules of bis(1-pyrazinylethylidene)hydrazine are clathrated in every hydrophobic host cavity, being further stabilized by π-π stacking and hydrogen bonding. The results suggest that the hydrazine molecules present in the network serve as structure-directing templates in the formation of crystal structures.

One Step Synthesis and Characterization of Zirconia-Graphene Composites

2012 ◽  
Vol 600 ◽  
pp. 174-177 ◽  
Author(s):  
Jian Fei Xia ◽  
Zong Hua Wang ◽  
Yan Zhi Xia ◽  
Fei Fei Zhang ◽  
Fu Qiang Zhu ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Graphene Composite ◽  
Transmission Electron ◽  
One Step ◽  
Ft Ir ◽  
Xrd Techniques

Zirconia-graphene composite (ZrO2-G) has been successfully synthesized via decomposition of ZrOCl2•6H2O in a water-isopropanol system with dispersed graphene oxide (GO) utilizing Na2S as a precursor could enable the occurrence of the deposition of Zr4+ and the deoxygenation of GO at the same time. Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) techniques were used to characterize the samples. It was found that graphene were fully coated with ZrO2, and the ZrO2 existing in tetragonal phase, which resulted in the formation of two-dimensional composite.

Two-dimensional lanthanide(III) coordination polymers: solvothermal synthesis, crystal structure, and stability

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Runmei Ding ◽  
Zixin He ◽  
Meilin Wang ◽  
Danian Tian ◽  
Peipei Cen
Keyword(s):  
Crystal Structure ◽  
Coordination Polymers ◽  
Solvothermal Synthesis ◽  
Analysis Data ◽  
Water Stability ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
X Ray ◽  
Solvothermal Conditions

AbstractBased on 2-(4-pyridyl)-terephthalate (H2pta) and oxalate ligands, two new lanthanide-containing coordination polymers (CPs), [Tb(pta)(C2O4)0.5(H2O)2)]·2H2O (1) and [Sm(pta)(C2O4)0.5(H2O)2)]·2H2O (2), have been synthesized under solvothermal conditions. The structures of both 1 and 2 have been determined by single-crystal X-ray diffraction. Infrared, elemental analysis, powder X-ray diffraction and thermogravimetric analysis data are also presented. The crystals of 1 and 2 exhibit isostructural layer-like networks, crystallizing in the triclinic space group P$‾{1}$. The layers are further stabilized and associated into 3D architectures through hydrogen bonding. Remarkably, the CPs 1 and 2 exhibit excellent water stability and remarkable thermostability with thermal decomposition temperatures of more than 420 °C.

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